<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>else语句</title>
</head>
<body>
        <script>
            var a = 90;
            if(a>90){

            console.log('优秀');
            }
            else
                console.log('良好')


        </script>
</body>
</html>